pandas.core.window.expanding.Expanding.count

Expanding.count(numeric_only=False)[source]

Calculate the expanding count of non NaN observations.

Returns:

Series or DataFrame

Return type is the same as the original object with np.float64 dtype.

See also

pandas.Series.expanding

Calling expanding with Series data.

pandas.DataFrame.expanding

Calling expanding with DataFrames.

pandas.Series.count

Aggregating count for Series.

pandas.DataFrame.count

Aggregating count for DataFrame.

Examples

>>> ser = pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])
>>> ser.expanding().count()
a    1.0
b    2.0
c    3.0
d    4.0
dtype: float64